import React, { Component } from 'react';
//引入store，用于获取redux中保存状态
import store from '../../redux/store';
//引入actionCreator，专门用于创建action对象
import {createIncrementAction,createDecrementAction, createIncrementAsyncAction} from '../../redux/count_action';

export default class Count extends Component {

    state = {
        count: 0
    }

    //检测redux中状态的变化，只要变化，就调用render
    // componentDidMount() {
    //     store.subscribe(() =>{
    //         this.setState({});
    //     });
    // }

    increment = () => {
        const {value} = this.selectNumber;
        store.dispatch(createIncrementAction(value*1));
    }

    decrement = () => {
        const {value} = this.selectNumber;
        store.dispatch(createDecrementAction(value*1));
    }

    incrementIfOdd = () => {
        const {value} = this.selectNumber;
        const count = store.getState();
        console.log("count", count)
        if(count%2 !== 0) {
            store.dispatch(createIncrementAction(value*1));
        }
    }

    incrementAsync = () => {
        const {value} = this.selectNumber;
        store.dispatch(createIncrementAsyncAction(value*1, 1000));
    }

    render() {
        return (
            <div>
                <h1>当前求和为：{store.getState()}</h1>
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>&nbsp;
                <button onClick={this.increment}>+</button>&nbsp;
                <button onClick={this.decrement}>-</button>&nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
                <button onClick={this.incrementAsync}>异步加</button>
            </div>
        )
    }
}
